如果你非要走动的话，别顺着溪流走，除非你对它很熟悉。但是如果你很熟悉，那你就不会迷路了。

If you must move, don't follow a stream unless you know it, and in that case, you are not lost.

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我们在草地上顺着灌溉他们的溪流走着。

We walked in the meadows, along the streams that watered them.

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然后，当你拔起堵住管口的塞子时，使用过的水就会顺着排水管流走。

Later, when you unplug the stopper, the used water will go rushing out down the drain.

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